on Page 253 and 395 of Anvils In America it says American Wrought Anvil Company made some Anvils with COLONIAL stamped above the American. Colonial is the trademark name for the Schwabacher Hardware Co. But Richard Postman said "the American anvils he has recorded have four handling holes and are flat under the base, and none have serial numbers. I know my is a Trenton because I don't have any handling holes, I have a Trenton Oval Base, and I have the Weight and Serial Number starting with an A just to name a few things.